You seem to be quoting a warning message, but haven't given us much detail on what equipment you are using to generate it, nor under what circumstances, it appears. If you are able to provide us with a little more detail on your system models and configurations, we might be able to provide better assistance.
But, as a starting point, the codec is reporting that it cannot hear itself back in a reasonable time frame, and that there seems to be quite a delay in the audio processing of whatever screen or audio system you have connected. If your codec is directly connected to a TM/monitor, check to see if it can be put in a "low latency" or "gaming" mode - there should be details on how to do this in your screen's user manual. Once the delay is in an acceptable range, this warning message will disappear. While it is present, the internal echo cancellation may not work as well as you may expect it to, resulting in echo at the far end of any of your calls.
Wayne
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